CompletableFuture的简单应用_completablefuture 传入list-优快云博客

本文展示了一个使用Java CompletableFuture进行并行处理的测试案例。通过对比同步和异步处理方式，演示了CompletableFuture如何提高多线程环境下的执行效率。

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package com.zhao.sian.hah;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;

import org.springframework.util.StopWatch;

public class CompletableFutureTest {

    public static void main(String[] args) {
    	
    	ExecutorService pool = Executors.newFixedThreadPool(10);
    	
        List<String> listStr=new ArrayList<String>();
        listStr.add("123");
        listStr.add("124");
        listStr.add("125");
        listStr.add("126");
        
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
        
        List<String> list = listStr.stream().map((s) ->{
        	return s + 10 + "yongqian.zhao";
        }).collect(Collectors.toList());
        
        for (String str : list) {
			System.out.println(str);
		}
        
        stopWatch.stop();
        System.out.println(stopWatch.getTotalTimeMillis());
        
        StopWatch stopWatch1 = new StopWatch();
        stopWatch1.start();
        
        List<CompletableFuture<String>>  userInfoList=listStr.stream().map((s)->{
            return CompletableFuture.supplyAsync(()->{
                return s+10;
            },pool).thenApply(str -> str + "yongqian.zhao");
        }).collect(Collectors.toList());
        
        userInfoList.forEach(value ->{
        	try {
				System.out.println(value.get());
			} catch (InterruptedException e) {
				e.printStackTrace();
			} catch (ExecutionException e) {
				e.printStackTrace();
			}
        });
        
        stopWatch1.stop();
        System.out.println(stopWatch1.getTotalTimeMillis());
        
        pool.shutdown();
        
    }
}